The vehicle navigation radio provides verbal directions to the driver through the radio speakers. The navigation radio sends an audio voice signal to the amplifier on two dedicated circuits.

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Navigation System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References

1. Ignition OFF, disconnect the radio harness connector X4 and amplifier harness connector X3.
2. Test for less than 1 volt on the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.

⇒	If greater than specified value, test for a short to voltage.

3. Test for greater than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.

⇒	If less than specified value, test for a short to ground.

4. Test for less than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and the amplifier harness connector terminal 13.

⇒	If greater than specified value, test for an open/high resistance.

5. Test for less than 1 volt on the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.

⇒	If greater than specified value, test for a short to voltage.

6. Test for greater than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.

⇒	If less than specified value, test for a short to ground.

7. Test for less than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and the amplifier harness connector terminal 5.

⇒	If greater than specified value, test for an open/high resistance.

8. If all circuits test normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming